Improvement in friction-pulleys



J .f STBGER. PRICTION PULLBY.

NoL 108,533. Patented Oct. 18, 1870.

N MiJ/ JOSEPH srnenn, or NnwYoRK., AN. Y.-

Letters Patent No. 108,533, dated October 18, 1870.

IMPROVEMENT IN FRICTION-PULLEYS.

The Schedule referred to in these Letters Patent and making part of the lame.

To all whom fit may concern Be it known that I, JOSEPH SrnGnn, ot' the city, county, and State of NewYoi-k, have invented a new and improved Friction-Pulley; and I do hereby declare the following to he a full, clear, and exact description thereof', which willenable'those skilledin the art to make and use Athe `sanne, reference being had to the accompanying drawing forming part of this specification, in which drawing- Figure l represents a transverse section of this invention.

Figure 2 is a sectionalfront iziew of the saine.

Similar letters indicate corresponding part-s.

This invention relates to apulley, which is provided with two internal cone seats, fitting on two disks, which are mounted on the shaft of the pulley," so that vthey can he moved thereon toward and from each other, but that they cannot revolve independent'of said shaft, and one of ,which is provided with springbolts extending through the other in such a manner that, hy tightening said bolts, a uniformpressure is exerted on both seats in the pulley, thereby preventing its face from being thrownin an oblique position and, furthermore, the friction exerted by the disks on the pulley, and consequently the power transmitted by said pulley, can be regulated at pleasure.

In the drawingv The letter `A designates a shaft, on which is mounted my friction-pulley This pulley is provided with two internal conical seats, a, which fit on corresponding conical disks, b b', as shown in tig. 1 of the drawing.

The disk b is lirml y mounted on the shaft A, while the disk b' is secured to the same by means of a leather-key, c, so that it can move toward and from the disk b without being allowed to revolve independent of the shaft.

To the inner surface 'of the disk b are secured two (or more) springs, d, from the loose ends of which extend screw-bolts e, provided with nuts ff The disk b' is provided with holes to receive the bolts e, and, by applying the nuts f, both disks can be drawn up against their seats with a yielding power dependent upon the tension of the springs d.

By turning the nuts in one direction, the tension ot -thcse springs is increased', and 'vice versa, and the power required to turn the pulley B on the disks b b' can thushe regulated to correspondto a certain maximum resistance. l

1f the shaft A is used to transmit-motion impart-ed to it by a belt running on the pulley B, and the resistance offered to the revolution of said shaft exceeds the fixed limit, said shaft will remain stationary, and the pulley will revolve on the disks b b.

It is obvious that lthe same effect will be produced if .the pulley Bis made inthe forniV of :mog-wheel, so that it can be driven by another cog-wheel instead of by a belt. I

By providing the pulley with two internal conical seats fitting on disks which are drawn up against said seats by a yielding force, the face of the pulley is always kept parallel with its shaft; whereas, if said pulley is provided'witha single conical seat, the disk,

on being forced into this seat', has a tendency to th row said pulley in an obliquel position, which is objectionable, and iu some .cases detrimental, to the correct operation ot' said pulley.

Another advantage of my friction-pulley is, that the springs are situated in its interior, where they are out ofthe way, and their tension can he regulated by simple screw-bolts;

What I claim asnew, and desire to secure by Letters Patent, is

1. The arrangement of two conc-seats in the opposite sides of a pulley or cog-wheel, fitting on disks b 11', which are capable of moving toward and from each other, without being allowed to revolve independent of the shaft on which they arc mounted, substantially as described.

`2. The springs 1,011 the inner surface of one of the disks b or b', in combination with bolts aand a pulley, B, fitting on said disks, substantially as set fort-h.

` JOSEPH STEGER.

Witnesses W. HAUFF, C. WAHLERs 

